Festo VTSA Series, Manual

Page: 98 / 166

4. Commissioning
4−6
Festo P.BE−VTSA−44−EN en 0601a
The table below shows the effects of slow start−up pressuriza
tion when there are electric signals.
External
pilot air Pressure
increase in
complete
supply Pressure
increase in the
pilot air
(12/14) Time point
when a valve
switches Movement of
the actuator
branched after the start−up
valve for delayed build−up
of pressure slow slow after pressure
increase at (1)
fast
branched in front of the
start−up valve for delayed
build−up of pressure slow fast before
pressure
increase at (1)
slow
Tab.4/1: Effects of slow start−up pressurization
4.2 Manual override
You should use the manual override especially when commis
sioning the pneumatic system, in order to check the function
and operation of the valve or the valve−actuator combination.
By actuating the manual override, you can switch the valve
without an electric signal. You only need to switch on the
compressed air supply.
Please note
If you use the VTSA valve terminal in a dusty environment,
Festo recommends that you protect the manual overrides
with cover caps type VAMC−S6−CS againt dirt and dust
when the valve terminal has been commisssioned. At the
same time the manual overrides are protected against
incorrect use.